Abstract
Cross stress of heat and high irradiance (HI) resulted in the accumulation of active oxygen species and photo-oxidative damage to photosynthetic apparatus of wheat leaves during grain development. Pre-treatment with calcium ion protected the photosynthetic system from oxidative damage by reducing O-.2 production, inhibiting lipid peroxidation, and retarding electrolyte leakage from cell. Therefore, high Fv/Fm [maximal photochemical efficiency of photosystem 2 (PS2) while all PS2 reaction centres are open], Fm/F0 (another expression for the maximal photochemical efficiency of PS2), ΦPS2 (actual quantum yield of PS2 under actinic irradiation), qP (photochemical quenching coefficient), and PN (net photosynthetic rate) were maintained, and lower qNP (non-photochemical quenching coefficient) of the leaves was kept under heat and HI stress. EGTA (a chelant of calcium ion) and LaCl3 (a blocker of Ca2+ channel in cytoplasmic membrane) had the opposite effect. Thus Ca ion may help protect the photosynthetic system of wheat leaves from oxidative damage induced by the cross stress of heat and HI.
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Claims 5
Claim · model-written summary
Heat and high irradiance caused active oxygen accumulation and photo-oxidative damage in wheat leaves.
- Taxon
- wheat
Triticum aestivume0 - Organ / stage
- leavese0
- Treatment
- heat and high irradiance (HI)e0
- Outcome
- accumulation of active oxygen species and photo-oxidative damagee0
- Qualifier
- during grain developmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cross stress of heat and high irradiance (HI) resulted in the accumulation of active oxygen species and photo-oxidative damage to photosynthetic apparatus of wheat leaves during grain development”
Claim · model-written summary
Calcium pretreatment protected wheat photosynthesis by reducing oxygen radical production, lipid peroxidation and electrolyte leakage.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Pre-treatment with calcium ione0
- Outcome
- O-.2 production, inhibiting lipid peroxidation, and retarding electrolyte leakagee0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-treatment with calcium ion protected the photosynthetic system from oxidative damage by reducing O-.2 production, inhibiting lipid peroxidation, and retarding electrolyte leakage from cell”
t0“wheat leaves”
Claim · model-written summary
Calcium pretreatment maintained high PS2 efficiency, photochemical quenching and net photosynthetic rate under heat and irradiance stress.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- calcium ione1
- Outcome
- Fv/Fme0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high Fv/Fm [maximal photochemical efficiency of photosystem 2 (PS2) while all PS2 reaction centres are open], Fm/F0 (another expression for the maximal photochemical efficiency of PS2), ΦPS2 (actual quantum yield of PS2 under actinic irradiation), qP (photochemical quenching coefficient), and PN (net photosynthetic rate) were maintained”
t0“wheat leaves”
e1“Pre-treatment with calcium ion protected the photosynthetic system from oxidative damage by reducing O-.2 production, inhibiting lipid peroxidation, and retarding electrolyte leakage from cell”
Claim · model-written summary
Calcium pretreatment kept non-photochemical quenching lower under heat and irradiance stress.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- calcium ione1
- Outcome
- qNPe0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower qNP (non-photochemical quenching coefficient) of the leaves was kept under heat and HI stress”
t0“wheat leaves”
e1“Pre-treatment with calcium ion protected the photosynthetic system from oxidative damage by reducing O-.2 production, inhibiting lipid peroxidation, and retarding electrolyte leakage from cell”
Claim · model-written summary
EGTA and LaCl3 produced effects opposite to calcium protection.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- EGTAe0
- Outcome
- opposite effecte0
- Comparator
- calcium ione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EGTA (a chelant of calcium ion) and LaCl3 (a blocker of Ca2+ channel in cytoplasmic membrane) had the opposite effect”
t0“wheat leaves”
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See all 20 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.